Mass Fraction (delta)

The Weight Paradox. To reach orbit, a rocket must be mostly fuel. Mass fraction measures the engineering discipline required to make tanks as light as possible while surviving the pressure of flight.

• ◓ Structure: The "dead weight" that must be minimized.
• ◓ Propellant: The energy source consumed during flight.
• ◓ Staging: Dropping empty tanks to improve the ratio.

Kinetic Resistance (Fk)

The Velocity Tax. Kinetic resistance is the physical manifestation of air friction. It is the force that limits how fast a rocket can travel through the "Soup" of the lower atmosphere.

• 🔥 Shear Stress: Force applied parallel to the surface.
• 🔥 Viscous Drag: Resistance caused by the "thickness" of air.
• 🔥 Thermal Soak: The transfer of friction-heat into the fuel tanks.

Breakaway Force

The Threshold of Flight. Breakaway force is the peak tension required to overcome static inertia. It is the defining moment when a machine becomes a spacecraft.

• ⚡ Static Hold: Overcoming the mechanical clamps.
• ⚡ T/W Ratio: Achieving > 1.0 for positive acceleration.
• ⚡ Initial Inertia: The energy needed to start the mass moving.

Load Parameters

The Environmental Constraints. These variables define the physical "Cost" of the mission. Changing the incline angle or the mass shifts the entire energy requirement of the flight profile.

• ◩ Mass Load: 500,000kg (Wet Weight).
• ◩ Vector Shift: Gravity components at 85°.
• ◩ Friction Loss: Calculated via mu s and mu k.

Mass Fraction (δ)

The Structural Ratio. This value defines the limit of space exploration. A rocket is essentially a "flying fuel tank" where the metal structure must be as thin as possible to maximize speed.

• ◈ Dry Mass: The engine, tanks, and electronics.
• ◈ Wet Mass: The full weight including propellants.
• ◈ Payload: The useful "cargo" sent to orbit.